Lead mechanism for wood-screw machines.



H. L, SMITH.

LEAD MECHANISM FOR WOOD SCREW MACHINES.

APPLICATION FILED SEPT. 17. 1915.

1,1705%. Patented Fqb. 8,1916.

@Ke/M 4 THE COLUMBIA PLAP 4DGRAPH c0., WASHINGTON, D. c.

sas arena amen.

HENRY L. SMITH, or WATERBURY, CONNECTICUT, assrsnoa To THE E. a.MANVILLE MACHINE COMPANY, OF NEGTICUT.

Application filed September 17, 1915. Serial No. 51,174.

To all whom it may concern:

Be it known that I, HENRY. L. SMITH, a citizen of the United States,residing at Vaterbury, in the county of New Haven and State ofConnecticut, have invented a new and useful Improvement in LeadMechanism for VVood-Screw Machines, of which the following isaspecification.

In automatic wood-screw machines the threading tool is fed back andforth for cutting the threads on theblanks, and for the purpose ofadvancing the tool at the required rate a lead cam, which operates inconsonance with the other mechanisms, is provided. As the machines aredesigned to make screws of different diameters and different lengths itis necessary, in order to have the pitches of the threads correct and toobtain efficiency in operation, to.

change the lead cam for the various changes in sizes of the screws to beproduced.

This invention relates to themechanism which imparts the feed to thethreading tool in machines of this character.

The object of the invention is to so arrange the lead mechanism that thefeed cam can be quickly changed without interfering with or disturbingthe relations of the intermeshing gears which drive the severalmechanisms of the machine in synchronism. In attaining this end the leadcam shaft is made in sections which are detachably fastened together sothat they will rotate as one part. One section of the shaft ispermanently mounted in the machine and has secured to it a driving gearand a transmission pinion, and the other section of the shaft isremovably mounted in the machine and carries the lead cam. When themeans which holds the shaft sections together is unfastened the cam partof the shaft can be withdrawn and the lead cam removed and anothersubstituted without disturbing the gear part of the shaft, and

thus without interfering with the gears or changing their intermeshingrelations.

In the accompanying drawings only so much of an automatic wood-screwmachine of a common type is shown as in necessary to illustrate theinvention.

Figure 1 shows a side elevation looking at the gear end of such amachine. Fig. 2 shows a front elevation of the gear end of the machine.Fig. 3 is a section on the dotted line 3-3 on Fig. 1. Fig. 4 shows theSpecification of Letters Patent.

WATERBURY, CONNECTICUT, A GURPORATION OF CON- LEAI) MECHANISM FQRWOOD-SCREW MACHINES.

Patented Feb. 8, 1916.

cnds of the lead shaft sections which inter- Inthe class of machinesillustrated the driving power is usually applied to the pulley l that ismounted upon the spindle 2 whicl'rcarries the jaws 3 that holdthe blankswhile they are being threaded. On the end of the spindle opposite thejaws is a pinion {1- which meshes with an idler 5 that is in mesh with agear 6. Connected to this latter gear is a pinion '7 which meshes w h agear 8 that is keyed to the hub 9 of a pinion 10. This pinion is in meshwith an idler 11 that is in mesh with a gear 12 connected with a pinion13 that meshes with a gear 14. All of these gears are usually inclosedin a protecting casing 15 that is fastened to the gear end of themachine.

The pinion 10, on the hub of which the driving gear 8 is mounted, iskeyed to the lead shaft and is employed as a transmission pinion forimparting motion to the following gears and pinions of the train. Theouter section 16 of the lead shaft is permanently held in bushings 17and 18. This section of the lead shaft has a longitudinal opening and onits inner end has a transverse tongue 19 and a centering hub 20. Theinner section 21 of the lead shaft at its outer end has a circularsocket 22 for the centering hub and transverse mortise 23 for the tongue19. A screw bolt 2% is turned from the outside through the centralopening in the section 16 into a threaded bore in the end of the section21 to hold the parts locked together. The lead cam 25 may be fastened tothe shaft section 21 by a key 26 and set-screw 27 in the common manner.The lead cam operates against the end of the threading tool shaft 28 forthe purpose of imparting the proper lead to the tool.

When, for any purpose, it is desired. to change the lead cam the screwbolt 24 is turned out and then the shaft section 21 is withdrawnlongitudinally until the lead cam can be removed and anothersubstituted, after which the shaft section 21 is pushed back and engagedwith the section 16. As there is no force exerted longitudinally,tending to separate the shaft sections, a relatively small screw boltmay be employed for holding them together. The rotary motion imparted bythe driving gears to the outer section is transmitted to the innersection of the lead cam shaft by the interlocking of the tongue on onesection with the mortise on the other. With this construction When thelead cam is changed the section of the lead cam shaft which bears thegears is not disturbed in any manner, and consequently the relations ofthe gears al- Ways remains the same.

The invention claimed is:

1. In a Wood-screw machine the combination of a sectional lead camshaft, one section of said shaft being movable longitudinally withrelation to the other section, means detachably connecting the shaftsections, a lead cam removably mountedon the longitudinally movablesection of the shaft, and a driving gear mounted on the other section ofthe shaft.

2. In a Wood-screw machine the combination, of a sectional lead camshaft, one section being permanently mounted in the machine, and theother section being removably mounted in the machine, a driving gearmounted on the former section and a lead cam mounted on the lattersection.

3. The combination in a Wood-screw machine, of a sectional shaft, onesection being movable longitudinally With relation to the other section,means detachably interlocking the adjacent ends of the shaft sections,means for normally holding the adjacent Copies 01' this patent may beobtained. for

ends of the sections of the shaft interlocked, a driving gear mounted onone section of the shaft, and a lead cam removably mounted .on theothersection of the shaft.

4. The combination in a Wood-screw machine, of a train of intermeshingoperating gears, a longitudinally separable shaft With one sectionpermanently connected With and rotated by said gears, and a lead camremovably mounted on and rotating With the other section of said shaft.v

5. The combination in a Wood-screw machine, of aosectional shaft, onesection being permanently mounted in the machine and the other sectionbeing removably mounted in the machine, an interlocking tongue andmortise on the adjacent ends of the shaft sections, a screw for holdingthe tongue and mortise in engagement, a driving gear mounted on oneshaft section and a lead cam mounted on the other shaft section.

6. The combination in a Wood-screw machine of a normally connectedsectional shaft, one section being longitudinally fixed and the othersection being longitudinally movable, a driving gear permanently held onsaid longitudinally fixed section, and a lead cam removably fastened onsaid longitudinally movable section of the shaft.

HENRY L. SMITH.

five cents each, by addressing the Commissioner of Patents. Washington,D. 0.

